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# File 'ext/active_record/relation/calculations.rb', line 7
def pluck(*column_names)
if @none
if @async
return Promise::Complete.new([])
else
return []
end
end
if loaded? && all_attributes?(column_names)
result = records.pluck(*column_names)
if @async
return Promise::Complete.new(result)
else
return result
end
end
if has_include?(column_names.first)
relation = apply_join_dependency
relation.pluck(*column_names)
elsif klass.connection.is_a?(ActiveRecord::ConnectionAdapters::SunstoneAPIAdapter)
load
return records.pluck(*column_names.map{|n| n.to_s.sub(/^#{klass.table_name}\./, "")})
else
klass.disallow_raw_sql!(flattened_args(column_names))
columns = arel_columns(column_names)
relation = spawn
relation.select_values = columns
result = skip_query_cache_if_necessary do
if where_clause.contradiction?
ActiveRecord::Result.empty(async: @async)
else
klass.with_connection do |c|
c.select_all(relation.arel, "#{klass.name} Pluck", async: @async)
end
end
end
result.then do |result|
type_cast_pluck_values(result, columns)
end
end
end
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